The Red Sox have promoted prospect Mookie Betts up to the big leagues, John Tomase of the Boston Herald reports. The 21-year-old will be available for Saturday night’s match-up against the Yankees in the Bronx.

Drafted out of high school by the Red Sox in the fifth round of the 2011 draft, this is just the fourth year of professional baseball for Betts. He started the season at Double-A Portland for the first time and quickly moved up to Triple-A Pawtucket, slashing a combined .345/.437/.520 with eight home runs, 48 RBI, and 29 stolen bases in 34 attempts.

Betts has traditionally been an infielder, but started playing the outfield more as the Red Sox have the third-lowest outfielder OPS in baseball. Additionally, the Sox had to shut down Shane Victorino for the time being after he experienced a setback during his rehab assignment due to back soreness.